Electron discharge device



June 4, 1940. J. BOHME- ELECTRON DISCHARGE DEVICE Filed Oct. 22, 1938INVENTQR. JOACHIM B O HME fl 1 W ATTORNEY.

Patented June 4, 1940 UNITED STATES ELECTRON DISCHARGE DEVICE JoachimBiihme, Berlin-Schoneberg, Germany,

assignor to Fides Gesellschaft fiir die Verwaltung und Verwertung vongewerblichen Schutzrechten mit beschranktcr Haftung,

Berlin, Germany, a corporation of Germany Application October 22, 1938,Serial No. In Germany October 27, 1937 2 Claims.

This invention relates to an electron discharge device particularlysuitable for use at high frequencies.

Push-pull tubes in which the two electrode 5 assemblies operating inpush-pull as well as the essential parts of' the oscillatory circuithave been accommodated inside one and the same glass vessel or bulb havepreviously been suggested. The particular purpose of such an ar- 1rangement has been to make it unnecessary for the current leads to carryRF currents, and as a result such difficulties as are attendant upon thesealing of the-current supply wires arising in tubes of the conventionaltypes are obviated. To this end the lead for the high potential suppliedto the plate is connected with a point along the internal oscillatorycircuit where the alternating potential is of zero value. The RF energygenerated in the tube is delivered from the tube and fed to the consumeror load by means of capacitive coupling from the outside. This couplingis usually effected by having on the outside of the tube metallicsurfaces such as laminations or sheets or gauzes, which, conjointly withthe 25 plates or anodes confined within the vessel, result in couplingcondensers.

Now, the present invention is concerned with an improvement upon thetype of tube previously disclosed and which results in an appreciablesimplification both in structure as well as in operation.

According to this invention, in a push-pull tube the metallic partswhich represent the outer coats of the coupling condensers form the wallor shell of the vessel. Inside these walls are two push-pull connectedelectrode systems including the essential elements of the oscillatorycircuit. Inasmuch as each anode or plate must cooperate with an outercoat of the coupling 40 condenser the tube either in transverse orlongitudinal sense is divided by an insulating, for excharge device madeaccording to my invention,

and Figure 2 shows a schematic section of a modification of the electrondischarge device shown in Figure 1.

Figure 1 illustrates a tube whose metallic shell is divided in thetransverse sense by an insulation body 3, the cup-shaped halves of themetal envelope being denoted l and 2. Coni'ointly with the anodes orplates 4 and5, these halves constitute the coupling condensers beforementioned. The leads brought to the consumer or load circuit are unitedin some suitable manner with the wall parts i and 2. The two cathodes 8and 9 are united into a common construction .unit," and the same is trueof the two grids 6 and l. The anodes 4 and 5 are inter-connected by aclip l0 whose inductance primarily governs the frequency of theoscillations generated in the tube. The lead l3 for the high potentialof the plate is connected with the symmetry point II of this clip. In asimilar way the grid lead M is'united with the symmetry point of theconnection be tween the grids 6 and 1 preferably in the form of ametallic cylinder Ma. The insulation body 3 has a hole l2 through whichthe clip ill may be passed. Similar holes are formed in the insulationbody for the grid and the plate leads, the said holes being convenientlysealed, say, by solder at the end where the lead-wires come out of theinsulator piece.

The tube here disclosed, as will be noted, combines in a simple way anelectrode system suited for the generation of ultra-short Waves togetherwith the necessary coupling elements, and arrangements are so made thatnone of the leads iscalled upon to carry RF energy, with the result thatsuch difficulties as will otherwise arise in the construction of theseleads Contrasted with other tubes of the push-pull type described, atube as here disclosed offers principally the merit that the mounting ofdistinct coupler means outside the tube shell is obviated, and suchmounting may in some instances tend to make the mounting of the devicemore difficult. For the purpose of supporting the tube in the rack thetube preferably is propped at suitable points of the insulator part 3.The latter may, in fact, be built so as to make it more adapted to thisend.

Another embodiment of a tube according to the invention is shown in Fig.2. This tube is divided longitudinally by an insulator part resultingthus in two wall parts l5 and I6. Cooperating with wall portion I5 isthe anode or plate l1, grid l9 and cathode 2|, While with the wall partIt cooperate the plate 22, grid and the filament la. The lead 21designed to bring in are obviated.

of the insulation body for the reason that thesemay be readily fashionedin all kinds of forms and shapes, and since they are easy to work.Moreover suitable methods have been suggested or disclosed in the priorart by which the metallic Wall may be intimately united with the ceramicpartition piece. The material mostconvenient v for the metallic parts ofa tube or vessel wall or shell is copper, though also other metals oralloys are serviceable, most especially those adapted to result inexcellent fusion or soldered junctions with vitreous or ceramicintermediary part.

While I have indicated the preferred embodiments of my invention ofwhich I am now aware and have also indicated only one specific application for which my invention may be employed, it will be apparent that myinvention is by no means limited to the exact forms illustrated or theuse indicated, but that many variations may be made in the particularstructure used and the purpose for which it is employed withoutdeparting from the scope of my invention as set forth in the appendedclaims.

I claim:

1. An electron discharge device having an envelope comprising a pair ofmetallic cup-shaped members with their open ends oppositely disposed toeach other, a partition of insulating material between said cup-shapedmembers and sealing said cup-shaped members together with an air- 2. Anelectron discharge device having an envelope comprising a pair ofmetallic cup-shaped members with their open ends oppositely disposed toeach other, a partition of insulating material between said cup-shapedmembers and sealing said cupshaped members together with an airtightseal, a cathode member extending through one of said cup-shaped membersand through said partition to provide a cathode in each of saidcup-shaped members axially of said cup-shaped members, a grid in eachcup-shaped member surrounding the cathodes, said grids being connectedand supported by a tubular member extending through and supported bysaid partition, an anode surrounding each of said grids, a conductorconnecting said anodes and separate conductors connected to said anodeconductor and to said tubular member for providing voltage leads to saidgrids and anodes, said partition enclosing the separate conductorsconnected to the anode conductor and the tubular member and providing aseal therefor between the metallic cup-shaped members. M

JOACHIM BOHME.

